/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package ru.miit.elearning.servlets.pages;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import ru.miit.elearning.hibernate.dao.CourseDAO;
import ru.miit.elearning.hibernate.dao.CurriculumDAO;
import ru.miit.elearning.hibernate.dao.HibernateUtil;
import ru.miit.elearning.hibernate.dto.CurriculumLevel;
import ru.miit.elearning.hibernate.dto.UserIdentity;

/**
 *
 * @author Cyclone
 */
public class SignUserServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String message = null;


        Session session = null;


        try {

            int userId = Integer.parseInt(request.getParameter("id"));
            String listType = request.getParameter("listType");

            session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();

            boolean selectStudent = false;
            boolean selectTutor = false;

            CurriculumDAO curriculumDAO = new CurriculumDAO(session);
            if (listType == null) {
                if (curriculumDAO.isUserInRoleStudent(userId) && curriculumDAO.isUserInRoleTutor(userId)) {
                    out.println("<form id=\"form\" <fieldset><legend>Выбор профиля учебного журнала</legend>");
                    out.println("<a href=\"SignUser?id=" + userId + "&listType=tutor\"><input type=\"button\" id=\"button1\" value=\"Назначение тьютора\" /></a>");
                    out.println("<a href=\"SignUser?id=" + userId + "&listType=student\"><input type=\"button\" id=\"button2\" value=\"Зачисление студента\" /></a>");
                    out.println("</fieldset></form>");
                    return;
                }
            } else {
                if (listType.trim().equals("tutor")) {
                    selectTutor = true;
                } else {
                    if (listType.equals("student")) {
                        selectStudent = true;
                    } else {
                        out.print("Пожалуйста, выберите тип списка курсов: student или tutor.");
                        return;
                    }
                }
            }

            CourseDAO courseDAO = new CourseDAO(session);

            List<CurriculumLevel> courseList = null;
            List<CurriculumLevel> courseAddList = null;
            if ((listType != null && selectTutor) || (listType == null && curriculumDAO.isUserInRoleTutor(userId))) {
                courseList = courseDAO.findCoursesByTutor(userId, null);
                courseAddList = courseDAO.findCoursesByNoTutor(userId);
                selectTutor = true;
            } else {
                if ((listType != null && selectStudent) || (listType == null && curriculumDAO.isUserInRoleStudent(userId))) {
                    if (request.isUserInRole("admin")) {
                        courseList = courseDAO.findCoursesByStudent(userId);
                        courseAddList = courseDAO.findCoursesByNoStudent(userId);
                    } else {
                        if (request.isUserInRole("tutor")) {
                            int tutorId = courseDAO.findUserIdByLogin(request.getRemoteUser());
                            courseList = courseDAO.findCoursesByStudentByTutor(userId, tutorId);
                            courseAddList = courseDAO.findCoursesByNoStudentByTutor(userId, tutorId);
                        } else {
                            out.print("У Вас нет прав на назначение пользователю курсов.");
                            return;
                        }
                    }
                    selectStudent = true;
                } else {
                    out.print("Выбранный пользователь не является тьютором или студентом и следовательно не может быть назначен на курс.");
                    return;
                }
            }

            if (selectStudent) {
                request.setAttribute("isStudent", true);
            }
            if (selectTutor) {
                request.setAttribute("isTutor", true);
            }
            request.setAttribute("courseList", courseList);
            request.setAttribute("courseAddList", courseAddList);
            request.setAttribute("user", session.get(UserIdentity.class, userId));

            getServletContext().getRequestDispatcher("/signUser.jsp").forward(request, response);
            if (session != null && session.isOpen()) {
                session.getTransaction().commit();
            }
        } catch (Exception e) {
            Logger.getLogger(SignUserServlet.class.getName()).log(Level.SEVERE, null, e);
            if (session != null && session.isOpen()) {
                session.getTransaction().rollback();
            }

            message = "Ошибка запроса списка курсов";
            e.printStackTrace();

            getServletContext().setAttribute("message", message);
            getServletContext().getRequestDispatcher("/signStudents.jsp").forward(request, response);

        } finally {
            out.close();

            if (session != null && session.isOpen()) {
                session.close();
            }

        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
